Flatten repo structure: move crawler/ to root, remove vqa/ and immoweb/

The crawler subdirectory was the only active project. Moving it to the
repo root simplifies paths and removes the unnecessary nesting. The
vqa/ and immoweb/ directories were legacy/unused and have been removed.

Updated .drone.yml, .gitignore, .claude/ docs, and skills to reflect
the new flat structure.

database.py

@@ -0,0 +1,23 @@
+import os
+from sqlmodel import create_engine, SQLModel
+from sqlalchemy.orm import sessionmaker
+from dotenv import load_dotenv
+
+load_dotenv()
+
+
+# PostgreSQL example (or use "sqlite:///database.db" for SQLite)
+# DATABASE_URL = "postgresql://user:password@localhost/db_name"
+# DATABASE_URL = "sqlite:///data/wrongmove.db"
+# DATABASE_URL = "mysql://wrongmove:wrongmove@localhost:3306/wrongmove"
+DATABASE_URL = os.environ["DB_CONNECTION_STRING"]
+
+
+debug = os.getenv("ENV", "dev") == "dev"
+engine = create_engine(DATABASE_URL, echo=debug)  # `echo=True` for debug logs
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def init_db():
+    """Create all tables (only for development; use migrations in production)."""
+    SQLModel.metadata.create_all(engine)